Modelica.Electrical.Machines.Losses

Loss models for electric machines

Information

This package contains loss models and their parameter records used for machine models.

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

Name Description
Modelica.Electrical.Machines.Losses.FrictionParameters FrictionParameters Parameter record for friction losses
Modelica.Electrical.Machines.Losses.BrushParameters BrushParameters Parameter record for brush losses
Modelica.Electrical.Machines.Losses.StrayLoadParameters StrayLoadParameters Parameter record for stray load losses
Modelica.Electrical.Machines.Losses.CoreParameters CoreParameters Parameter record for core losses
Modelica.Electrical.Machines.Losses.PermanentMagnetLossParameters PermanentMagnetLossParameters Parameter record for permanent magnet losses
Modelica.Electrical.Machines.Losses.Friction Friction Model of angular velocity dependent friction losses
Modelica.Electrical.Machines.Losses.InductionMachines InductionMachines Loss models for induction machines
Modelica.Electrical.Machines.Losses.DCMachines DCMachines Loss models for DC machines

Modelica.Electrical.Machines.Losses.FrictionParameters Modelica.Electrical.Machines.Losses.FrictionParameters

Parameter record for friction losses

Information

Parameter record for Friction losses.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

NameDescription
PRefReference friction losses at wRef [W]
wRefReference angular velocity that the PRef refer to [rad/s]
power_wExponent of friction torque w.r.t. angular velocity

Modelica.Electrical.Machines.Losses.BrushParameters Modelica.Electrical.Machines.Losses.BrushParameters

Parameter record for brush losses

Information

Parameter record for three-phase Brush and DC Brush losses.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

NameDescription
VTotal voltage drop of brushes for currents > ILinear [V]
ILinearCurrent indicating linear voltage region of brush voltage drop [A]

Modelica.Electrical.Machines.Losses.StrayLoadParameters Modelica.Electrical.Machines.Losses.StrayLoadParameters

Parameter record for stray load losses

Information

Parameter record for three-phase and DC stray load losses.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

NameDescription
PRefReference stray load losses at IRef and wRef [W]
IRefReference RMS current that PRef refers to [A]
wRefReference angular velocity that PRef refers to [rad/s]
power_wExponent of stray load loss torque w.r.t. angular velocity

Modelica.Electrical.Machines.Losses.CoreParameters Modelica.Electrical.Machines.Losses.CoreParameters

Parameter record for core losses

Information

Parameter record for core losses of induction machines and core losses of DC machines.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

NameDescription
mNumber of phases (1 for DC, 3 for induction machines)
PRefReference core losses at reference inner voltage VRef [W]
VRefReference inner RMS voltage that reference core losses PRef refer to [V]
wRefReference angular velocity that reference core losses PRef refer to [rad/s]

Modelica.Electrical.Machines.Losses.PermanentMagnetLossParameters Modelica.Electrical.Machines.Losses.PermanentMagnetLossParameters

Parameter record for permanent magnet losses

Information

Parameter record for permanent magnet losses.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

NameDescription
PRefReference permanent magnet losses at IRef and wRef [W]
cPart of permanent magnet losses at current = 0, i.e. independent of current
IRefReference stator RMS current that PRef refers to [A]
power_IExponent of permanent magnet loss torque w.r.t. stator current
wRefReference angular velocity that PRef refers to [rad/s]
power_wExponent of permanent magnet loss torque w.r.t. angular velocity

Modelica.Electrical.Machines.Losses.Friction Modelica.Electrical.Machines.Losses.Friction

Model of angular velocity dependent friction losses

Information

The friction losses are considered by the equations

   tau / tauRef = (+w / wRef) ^ power_w    for w > +wLinear
 - tau / tauRef = (-w / wRef) ^ power_w    for w < -wLinear

with

  tauRef * wRef = PRef

being the friction torque at the reference angular velocity wRef. The exponent power_w is approximately 1.5 for axial ventilation and approximately 2.0 for radial ventilation.

For stability reasons the friction torque tau is approximated by a linear curve

  tau / tauLinear = w / wLinear

with

  tauLinear = tauRef*(wLinear/wRef) ^ power_w

in the range -wLinear ≤ w ≤ wLinear with wLinear = 0.001 * wRef. The relationship of torque and angular velocity is depicted in Fig. 1

frictiontorque.png
Fig. 1: Friction loss torque versus angular velocity for power_w = 2

See also

FrictionParameters

If it is desired to neglect friction losses, set frictionParameters.PRef = 0 (this is the default).

Extends from Machines.Interfaces.FlangeSupport (Shaft and support), Modelica.Thermal.HeatTransfer.Interfaces.PartialElementaryConditionalHeatPortWithoutT (Partial model to include a conditional HeatPort in order to dissipate losses, used for textual modeling, i.e., for elementary models).

Parameters

NameDescription
frictionParametersFriction loss parameters
useHeatPort=true, if heatPort is enabled

Connectors

NameDescription
flangeShaft end
supportHousing and support
heatPortOptional port to which dissipated losses are transported in form of heat
Automatically generated Thu Dec 19 17:19:57 2019.